Power transmission



Aug. 11,1931. f f Bumm 1,818,564

y POWER TRANSMISSION FiledDeC. 28, 1928 4 Sheets-Sheet l INVENTOR.

A TTORNEY.

Aug. 11, 1931.

K. E. LYMAN POWER TgANsMIssIoN Filed Dec'z.

28, 1928 4 Sheets-Sheet 5 INVENTOR.

ATTORNEY.

Aug- 11, 1931. K. E. LYMAN 1,818,564

POWER TRANSMISSION 1 Filed-Dec. 28, 192e 4 sheets-sheet@ INVENTOR. I

ToRNEY.

Patented Aug. 11, 1931 UNITED .STATES PATENT orrica XENNETH E. LYMlAN, OF ROCXFORD, ILLINOIS, .ASSIGNOR TO AUTOMATIC TRANSMIS- SION COMPANY, OF BOCKFORD, ILLINOIS, A CORPORATION OF ILLINOIS POWER TRANSMISSION Application led December. 28, 1928. `Seria1'No. 328,951.

My present invention relates in general to power transmissions and has particular reference to lan improved speed changing mechanism for transmitting a variable drive .from a driving element to. an element to be driven.

For the purpose of illustrating the invention and explaining the construction and operation. thereof, I have elected to show a form which lends itself unusually well as a speed changing. mechanismfor motor vehicles. I wish it to be understood, however, that the invention is not necessarily limited to this particular use as it may wellY find expression`in a speed changing mechanism for other power transmissions where- 1n 1t 1s desirable to effect a variable driving ratio between two elements such as a driving shaft and a driven shaft.

One important object ofthe invention is to provide a mechanism of the above described character which will automatically to change the driving ratio between a driving element and an element to be driven.

Another important object of the invention is to provide a mechanism as above described which maybe produced commerciali in competition with present day motor ve icle transmissions so that the same may be substituted therefore and as a result improve the construction and operation of motor vehicles not only by eliminating the manual manipulation of the speed changing mechanism but also by accomplishing a much wider'range of practical operation than has been heretofore possible with known types of transmissions.

It will be thus observed that I have developed a power transmission which is not only an improvement on account of its automatic opera-tion but also an improvement in another sense, in that aside from the automatic operation, it is Amore eiicient from.

an economical fuel consumption view point, quietness in operation, the absence of diiiicult parts to manufacture and in this connection attention is called to the few-.parts required to make up the assembly. Aside from all these advantageous features, it is function capable of `establishing between the driving v claims.

One embodiment of the invention is presented herein for the purpose ofillustration but it will of course be understood that the invention is susceptible to other different modified embodiments which come equally within the scope of the appended claims.

In the accompanying drawings Fig. lis a longitudinalsection of a transmission constructed in accordance with my invention.

Fig. 2 is a view in cross section on the line 2 2, Fig. 1.

Fig. 3y is a viewl in cross section on the line 3 3, Fig. 1. y

Fig. 4 is a view in cross section on the line 4 4, Fig. '1.

Fig. 5 isy a view -insection taken on the line 5 5, Fig. 2. y

Fig. 6 is a detailed view of a section taken on the line 6 6, Fig. 5 and Fig. 7 is a view'in cross section similar to Fig. 3 but showing a slightly `modifiedl form.

Referring now to the drawings in detail and according to the embodiment of the invention `selected for illustration: l represents a motor shaft which is mounted in driving relation with the flywheel part of a combined flywheel and clutch 2. The clutch 2 is inclosed within a bell -housing 3 and may be employed as an instrumentality for Centrally formed in the end wall 7 ofthe bell-housing is an opening 8 which su ports an `anti-friction bearing 9 in .whicrh the clutch shaft 1 isjournaled. For the purpose of the present descri tion it may be considered that the clutch siiaft 1 isa driving element. Since the transmission case 6 will ordinarily contain a quantity of lubri- 1 around 'the anti-friction b'earing 9 and shaft is adapted to be connected wi intervening bushing The sun gear sleeve cant it becomes necessary to seal the same to retain the lubricant. For this reason an .oil retainer 10 is mounted on the clutch shaft the flange 11 of the retainer is bolted or otherwise secured as at 12 to the end wall 7 of the bell-housing on the outside of the transmission case. The clutch shaft 1 preferably terminates at the end wall 7 of they bell-housing 3, except that it is made with a rearwardly presented sleeved fitting 13 which extends into the transmission case to receive the driven shaft 14 otherwise referred to as the driven element. y The driven shaft 14 is provided with ayplotl vwhich is accommodated in an axial bore in the `clutch shaft 1 so that the drivenjshaft: may beproperly supported with freedom of rotation relative to the clutch shaft. The driven shaft 14 is supported-in van opening 16 in the end wall 17 ofthe transmission' case b means of an anti-friction bearing 18. ere again the transmission case is properly sealed` ainst th escape of the lubricant contain therein. lFixed to rotate with the driven shaft andvmounted .rearwardly of the tron Ais a brake drum 19 which contributes to a hand operated parking or emergency brake. The drum 19 bein which is bolte transmission caseas at'21. Provided also in this bracket 20 is a speedometer take-off v22. The universal joint-equipped pro the driven shaft as at 23. Y'

-Slidabl mounted on the outelcircumference'of t eA sleeved fitting 13 is an axially shiftable clutchingdog 24. The pro v lugs 25 of thisclutching device 'are .a apte ring -member 26 which is riveted, bolted, or otherwise secured as at 27 to a radial plate 28. The ring member 26 in this connection is journaled on a sun gear sleeve 29 with an fitting 13 is splin is a planet gear 40.

formed witha bracket 20- or otherwise secured to the ller 29 willbe more specifically hereinafter referred to. The radial plate -28'\is formed with a rearwardly presented circular band 31 which forms one com anion part of a housing for the control sprlng 32. Theother companion part of this spring housing com- `prises a plate 33 which 1s riveted or otherwise secured as at 34 to a flange 35 on the sun gear sleeve 36. This sun gearI sleeve will be hereinafter more particularly referred to. The plate 33 like the late 28 is made with a rearwardly presente circular band 37 concentrically arranged relatively of the band 31 and the extremity of the band 37 is bent outwardly to overlap the edge of the band 31 to provide an end closurev 38 for the spring housing. One endy of the spring 32 is connected or anchored to the plate 28 as at 28 and the opposite end of the spring is similarly connected or anchored to the end closure 38 on the plate 33.

As will be readily seen from the illustra-- tion in Fig. 1 when the clutchingdog 24 is in the position shown 4the plate.2 8.1s connected 1n driving relation with thejdriving shaft whereas the plate 33 is :connected in drivin relation with lthe drivin @shaft throng the sun gear sleeve 3(5-a'1itl-tv e gearing connected therewith. j .Referring-howto the sun gear sleeve 29 inv Fi .liga-.it willbe seen that this sleeve is spline .oni-.the inside of the sleeved fittin 13 and'thatlthe sleeved on thefoutside -'for theYV clutching'dog 24. 'Il he sleeve 29 in Fig. 1 extends rearwardly andA terminates in an integral sun gear 39 and meshingtherewith also 1n constant mesh wi v which is fixed in drivingrelationfwithv the driven shaft 14 by a plate 42 which isi'iveted or otherwise fixed to the ring'gear usage-amo is, Q aringg'ear 41 los' 41 as at 43 and riveted or otherwise fixed as at 44to a flange 45 on the driven shaft. It will thus be seen that the sun ear 39 is in fixed drivin relation with the dgriving shaft. Although e planet gear 40 is in constant mesh with the'sun gear and ring gear, the

driveA from the driving shaft tothe driven Y shaft will onl lbe established at forward s when t e clutching dog is engaging t e' plate 438. This detail of operatlon o the mechanism will be more specifically referredto in a laterv part of the description.

The planet gear 40 'is splined or otherwise fixed on a planetI shaft 46. This shaft is 'journaled in a planet carrier or spider- 47 with intervening bushings 48 and mounted i -on the end opposite of the planet shaft 46 to be moved into and out of engagement. o with openings, slots or thelike formed in a s lined 'or otherwise 'xe onv t e planet aft and is coaxiall-lilnounted relatively to the planet gearv 40.' e planet gear 49 1s in constant mesh with a sun Vgear 501on the sun gear sleeve 36. and is therefore connected' in fixed the sleeve 29.

plate 33. The spider or .planet carrier 47 "floats between the planet gears 40 and 49 at forward speeds and is journaled with freedom of rotation relatively to the sun ear spider` 47 is controlled by the gear ratios between the sun gears 39 and 50.

In the foregoing description no mention has been made of the companion planet `ears 40 and 49 which `are diametrically opposed to the gears 40 and 49.\ These companion planet gears are of importance only .in balancing the mechanism and they perform no function that is not performed by the gears 40 `and 49, except that as stated, they balance the mechanism and provide a more practical construction than if they were eliminated..l It is of course understood that the gear 40 is in constant mesh with bhe ring gear 41 and the sun gear 39 and that the gear 49 is in constant mesh with the sun gear 50. The planet. shaft 46 on which the gears 40 and 49 are splined is journaled in the spider or .is is the planet shaft 4G.

The clutching dog 24 is axially shifted by means of a manual manipulated fork 51. The curved segment on the fork is seated in an annular groove 52 in the circumference .if the clutching dog. The opposite end of the fork is made with a collar 53 which is ixed on a shifting rod 54 by means of a set screw 55 or other suitable means. rihe rod 54 is accommodated withinan off-set corner 5G on the transmission case/and it extends rearwardly of the case with web portions 57 supporting the same. lt extends through the case and is further supported by a boss 58 on the outside of the case as best illustrated in Fig. 1. Any suitable manually operable lever arrangement may be secured planet -carrier 47,

to the end of the rod for actuating the same from the drlvers seat of the motor vehicle..

Operation of the rod y54 not only positions the clutching dog 24 but -it also controls the 'pawl 59 which is fixed on the rod 54 within. the transmission case and is adapted tobe moved into engagement with the ratchet teeth 60 on the spider 47.

For forward speeds the clutching dog is positioned as shown in Fig. 1, that is, in engagement with the platel28 of the spring housing. For forward speeds the pawl 59 55 is retained out of engagement with the ratchet teeth 60 on the spider by means of a spring (S1 which is coiled around thev rod 54. The coiled end of this spring bears against the inside of the top of the transmission case and the opposite end is anchored in an opening G2 in the pawl. The spring is wound so as to retain the pawl 59 normally out of engagement with the spider f 47. lNhen it is desired to reverse the drive, the rod 24 is shifted forwardly to disengage the clutching dog 54 from the plate '28, then Thus, the forward motion o then by turning .the rod the pawl 59 may be brought into engagement with .the ratchet the sun gear 39 as in forward speeds but the spider 47 is held against rotation. The ring gear'41 will be driven in a reverse direction which will ofcourse reverse the driven shaft.

As best illustrated in Fig. 5, the pawl 59 is mounted on the rod 54 by a collar 63 and the collar is forlned with a slot 64 in which the pin 65 on the rod 54 is free to slide. When the rod 54 is shifted forwardly to disengage the clutching dog 24 and when it has been shifted far enough to `completely disengage the clutching dog, the pin G5 will be positioned in the closed end G6 of the slot 64 so that when the rod is then turned, the pawl will be rocked into engagement with the ratchet teeth 60. To prevent rotation v stop 67, it becomes positioned in the closedy end 66 of the slot 64 whereupon rotation of the rod will move the pawl into Vengagement with the ratchet teeth as previously described. By means of this stop 66 there will be no possibility of arresting the rotation of the spider until the clutch has been thrown out. Wfhen the clutch is in, it will be yieldably held under the influence of a round headed" spring pressed plunger 68 seated in an annular groove 69 in the rod 54. rlfhe round headed plunger G8 is formed on the end of a cylinder 70 which is accommodated in an opening 71 in the transmission case 6 and thesi ring 72 is confined in the cylinder 70 with its end bearing against a block 73 which closes the opening 71 from the outside of the case. When the rod 54 has-been shifted to disengage the clutch, the annular groove 69 will have been moved to the right viewed from Fig. 6 and the depression 69 will be moved into registrywith the round headed plunger 68. This is the neutral position of the rod and it is yieldably held in this position. When the rod 54 is turned to move the pawl into engagement with the ratchet teeth for reversing, the depression 692 will be brought into registry with theround headed plunger 68 iuence of the spring 61. other words,

vsa

-modi the Eawl is vmoved into engagement with the r`atc et teeth against the resistance of the spring 61 and it is possible that the spring 51 would return the rod were it not for the yielding action of the round headed plunger lwhich 1s sufiicient to overcome the iniuence of the Aspring 61.

In themodiied embodiment illustrated in Figi. 7, I have shown how it would ossible to' use an extra set of plant gears 4 and 75. As will be fully explained when `describing theoperatioiuof the mechanism in the preferred construction, the two plates 28 and 33 of the housing for the spring 31 -rotate inthe same direction, by using an extra pair of planet gears such as 74 and 75 and meshing the s'ame with the sun gear 50 and the two planet gears 49 and 49'; the plate 33 of the spring housing will be caused to rotate in ,an o posite direction to that of the rotation of he plate 28. Of course, it is understood that in such an arrangement, theI planet gears 49 and 49 will not be in mesh with the A,sungear 50. With this modifled embodiment the spring 32 will be wound up much quicker than 1t would be if the plates 28 and 33 were both driven in the same direction; It is of course understood that when the plates are driven in the same direction, the late 33 rotates faster than the late 28 which action winds the spring u t mi ht be also pointed out here that in this iisd embodiment only'one set of planet gears 49 and 74 or 75 and 49 are required, except the addition of the duplicate lset balances the mechanism and is a more prac- .tical construction.

In analyzing the construction and cooperativey relationship ofparts of the mechanism, it will be seen that I have devised a transmission which embodies in its construe# tion planetary gearin for 'connecting the drivin and drlven, e ements in different speed ratios. The lanetary gearing in this respectcomprises t e sun gear-39, the planet gear 40 or the planet gears 40 and 40' and the ring gear 41. The planet gear 40 or the planet gears 40 and 40" com rising a planetating ower transmitting e ement or elements in t e planetarygearing. In addition'to this planetary gearing I` have also provided means for automatically ,changing the ratio, comprising a resiliently restraine gear train comprisingthe planet gear 49 or` the planet gears 49 and 49 and the .sun ear 50. In the modified embodiment shown l 1n Fig. 7 this resiliently restrained gear 'train is made up ofthe sun'A gear 50 and the planet gears 49, 49', 74 and7 5. The resilient.y

restraint on the gearltrainis realized by the tion-of the decree o drive is planetating'power transmitting element such as the planet gear 40 about its own axis and as a result the driving ratio is automatically changed to 4compensate for the variations in load on the driven sha-ft.

To more fully explain the o eration of the mechanism, it may be explained that a transmission constructed in accordance with my invention willv automatically develop variable forward speeds by torque balance. f

system is also connected in driving relation' with the driving shaft and this isalso true of the plate 33 to which one end of the spring 32 is anchored. When the clutching dog 24v is engaged with the plate 28 as it will be for forward speeds, the plate/28 to which the opposite ends of the spring 32 isl anchored is also connected with 'the driving shaft.

When torque is applied to the driving shaft, a turning movement is applied to the planet gears 40 and49 in a clockwise direction viewed from Fi 2. This winds up the spring 32 and ma es the resiliently restrained sun gear 50 run ahead of the sun gear 39. The planet spider of course will e turning in a clockwise direction viewed ,from Fig. 2 and the tension of the spring 32 is exerted through the planet'gears. This tension operates through the planet ear 40 which meshes. with the sun gear 39, w ich is a fulcrum for the planet ear, causing a clockwise rotation, viewed rom Fig. 2, of the ring gear 41. As the gear ratio is a function of the internal ring gear vsystem planetation, the vdifferential motion of the spider carrying'the planet. gears is a func- In operation the driving tor ue causes the sun gear 50 to run aheadan at the same time the action tends to cause relative retrograde action of the spider.

When the torque required to drive the' driven shaft appraches the driving torque, the spring unwinds which causes an acceleration fthe spider in an anti-clockwise direction viewed from Fig; 2 which in turn accelerates the ring gear, but in as much as the sun ,gear 39 rotates at`a substantially constant rate, a substantially 4one to one agproached. This continues until y equal torques reduce the sys- Torque unbalancing substantie tem to a unit drive.

flexing 'of the spring.

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of the drive and driven-shafts will resultin such changes in gear ratio as is deter- ,40 to planetate at a fixed ratio.

f 32 and the asiasee could be stated that the resiliently restrained gear for yieldably iniuenci-ng the rotation of the gear 40 about its ownaxis varies the tooth pressure between the gear 40l and the ring gear and of course the sun gear 39, and as a result changes the rate of rotation of the driven shaft. Describing the operation in still another Way, there are in reality three differential systems in the construction illustrated. The first consists of gears 50, 49, 40 and 39. When gears and 39 are rotated at the same speed, the differences' of gear` ratios of the gears 50 and 39 causes gears 49 and In the second system are gears 39, 40 and 41, When gear 39 is 'rotated and the gear eil, which is the load carrying member, is stationary the gear e0 -will planetate at a predetermined speed. It gear al is rotated, in a forward direction, the planetation of the gear 40 will be a mathematical function of the rotation of the gears 39 and al. The third system is the combination of systems one and two and the diiierential action vdeveloped thereby. Thus, it may be noted, that in a forward drive osition of the transmission, the gear d() eingconnected to the gear 39 through the resilient member ear 41 will be rotated forward by reason oi differential action between dit :teren'tial systems one and two through and as determined by the degree of flexing of the vresilient member 32.

' vThe spring which i prefer to use for the resilient restraining member is so constructed as to possess the maximum resiliency and strength for its Weight and size. The mounting is such as to place no internai strains in operating under any degree of fiexing.

The novel Way of mounting the spring 32 'should be given due consideration and in this connection, it should be noted that the circular band 31 limits unwinding the spring and the band 37 limits the extent to Whlch it ma be Wound up. It is therefore held and llmited in its Winding and unvvinding action.

It is interesting to note that the mechanism requires only seven gears and. a minimum number of other parts. It will therefore be unusually economical to .manufacture not only compared to heretofore suggested types of automatic transmissions but also compared. to conventional types of transmissions employed in the present day motor vehicle.

Having thus described and shown an embodiment of my invention, what I claim and desire to secure by Letters Patent of the United States is:

1. In an automatic transmission, driving and driven elements, change speed gearing for connecting said elements and means for mitting automatically changing the driving speed, comprising 1n combination, a drive transgear mounted -for movementand through which t e`drive is transmitted from the driving element to the driven element, torque responsive resilient restraining" means for influencing the rotaplanetating tion of said drive transmitting gear anda dlfferential. gear system connecting sald resilient restraining means with said drive transmitting gearg y 2.v In an automatic transmission, driving and driven elements, a spring restrained plural differential ear system connecting said elements, a drive transmitting lanet -gear functioning as an element" in sai gear system and through which the drive is transmittedfrom the driving element to the driven element, a planet shaft on which said planet gear is mounted, a ioating carrier for said shaft and means for holding said carrier against rotation for reversing the drive.

3. In an automatic transmission, driving and driven shafts, speed changing gearing for connecting said shafts and means Jtor automatically changing the dritiing speed, comprising in combination, a spring restrained plural diderential gear system, means for yieldingly connecting certain of the elements in said system With the driving shaft, means for connecting said system with the driven shaft, a geariunctioning as an element in said gearsystem and through which the drive is imparted to the driven shaft from the elements connected with the driving shaft.

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et. In a transmission, driving anddriven elements, speed changing mechanism for connecting said elements in variable drivn ing ratios, a sun gear and ring gear in said mechanism, means for connecting said sun gear with the driving element, means for connecting said ring gear with the driven drivingratios, a planetating drive transmitting member inl said vmechanism through which the drive is imparted from the driving element to the driven element and means for automatically changing the "driv-l ing ratio in said mechanism, comprising a diii'erential ear vsystemin which' said planetating rive transmitting gear` functions as an element, a planet gear 1n said lll@ lll@

' '-di-Rerential gear synchronized with ratios, a sun gear in said mechanism, means for connecting said sun gear with the driv- 'ing shaft, a ring gear, means for connecting said rin gear in driving relation with the driven s aft, a primaryplanet gear meshing with said sun gear and said ring r, a planet shaft for said planet gear, a anet carrier in which said shaft is journa ed, a second planet gear mounted on said lanet shaft, a secondary sun gear with whi said secondary planet ear meshes, a sprin coiled to yieldably influence the rotation o said primary planet gear aboutits ownaxis and a mounting-for connectin the spring with the driving s and the other end with said second sun gear.

'7. Ina transmission, a sha adapted for connection with a prime mover, a clutch shaft, \a clutching mechanism connecting said shafts, a housing for said clutching mechanism, atransmission case mounted on said housing, a driven shaftextendin into lsaid transmission case coaxially o said clutch shaft and mounted for rotation rela- ;tivel of the clutch shaft, a two part mounting or a coiled spring in saidrtransmission case, means for connecting one part of said t mounting with the clutch shaft, a gear jour naled on .the drivenfshaft, means for connecting the other partof said spring mounting in drivingrelation with said gear, a lanet gear meshing with said gear, a shaft or sai planet gear, a plaiet carrier journaled on said driven shaft and in which said 4planet shaft is journaled said carrier being mounted with freedom of Y driven shaft driven in. one direction,

means'for holdi said carrier against rotation and in eansngir disconnecting the drive ,between the clutch shaft and one vpart-of the sprin mounting for reversing' the direction of drigve of the drivenshaft a power transmitting planet gear mounted Aon said planet shaft coaxial with-said named planet gear and s aced therefrom 'by said'planet earner, sai power'transmitting planet gear functioning asan element in a lprimary, gear system an .means for oonnectingaone element of said system withthe clutch shaft and another element of said system with the driven shaft.

8. In`al transmission, a driving shaft2 a clutchin device having a part with which the drivmg shaft is connected, a clutch shaft connected with another part of the clutching one end of restrained rotation when1 theL tosaid driving gear, a planetgear meshin comprising a secondar Afor connecting'one o t e secondary gear train coaxia ly with saidv planet gear for lmovement therewith', a

device, a'driven shaft mounted coaxially with the clutch shaft and for jrotation relatively thereof, a sun gear journaled on the driven shaft, means for connecting said sun gear in driving relation with the clutch shaft, a ring gear, means for connecting said ring gear in driving relation with the driven shaft, a planet shaft, a primai' planet gear mounted on one end of `sai planet shaft and meshing with saidl sun gear and said ring gear, a secondary lanet gear mounted on the opposite end o said planet shaft, a planet carrier ffor said planet shaftmounted to iioat at orw'ard drives between the primary and secondar planet gears, a secondary sun gear wit which said secondary planet gear meshes, a coiled spring, a two-part mounting, for said spring, means for connecting one end of the spring with one part of said mountin and means for connecting theother part o said mounting with the opposite end of the s ring means for connecting' one part o said mounting tothe secondary sun gear ,.means for releasably connecting the other part of said mounting to the clutch shaft and means for reversing the drive in said mechanism, comprising a clutch for disconnecting the clutch shaft with the spring mounting and means for holding the planet carrier against rotation.`

necting said elements in variable driving ratios, a driving gear and driven gear in said mechanism, means for connecting said driving gear withv the driving element` means for connecting said driven gear with the drivenelement, a planet ear meshing with said driving ear and sai driven gear and throu h whic the drive is imparted from the riving element to the driven ele-- ment and meansa for automatically ch'aiiginr the driving ratio, com rising a resiliently gear coaxia y mounted relative with said resiliently .restrained gear an mounted in fixed coaxial relation with said ii'rst namedplanet gear. l

10. In a' transmission, a power moved ldrivingeleinent, a load moving driven element means for connecting sai variable driving ratios and means for automatically changing the ratio, comprising in combination, a planetary gear train, a planet gear in said gear train t rough which the rive is imparted from thedrivingelement to the driven element and a torque balanced device for changing the rate of planetation of said planet gear and compensating for the load resistance on said driven element, ear. train, means 'ears in said elements in vspring device, means for connecting one c nd of the spring device for winding action Wlth lanother gear in said secondary gear train which moves in the same direction as the driving element but relative thereto and means for connecting the opposite end of said spring device with the driving element for winding action.

11. In a transmission, a power moved driving elemen't, a load moving driven element, means for connecting said elementsin variable driving ratios and means for automatically changing the ratio, comprising in comblnation, a planetary gear train,

' 15 a planet gear in said gear train through which the drive is imparted from the driv, ing element to the driven element and a torque balanced device for changing the rate of planetation of said planet gear and com- I pensating for the load resistance on` said 'driven element; said device comprising a spring mechanism, means for connecting one end of the spring mechanism with. the driving element Afor Winding action, meansfor g5 connecting the opposite end of the spring mechanism with said planet gear for Winding action in the same direction as the op' posite end but at a different rate of angular movement relative to the opposite end.

so Signed at Rockford, in the county of Winnebago and State of Illinois, this 26th day of December, 1928. 

